Stovepipe-damper.



No. 833,554. PATENTED 001m, 1906.

A. sGHWQLL. I STOVEPIPE DAMPER.

APPLIOATIO'H TILED FEB. 8- 1906.

ANNA. SCHWOLL, OF LEIrsIG, OHIO.

' 'eTovEPm -DAM'PER,

Specification of Letters Patent.

Patented Oct. 16,1906,

Apnlicetion filed February 8, 1906. Serial No. 800,066.

1'0 all whom, it may concern:

Be it known that I, ANNA SoHwoLL, a citizenof the United States, and a resident of 1 Leipsic, in the county of Putnam and State of Ohio, have invented a new and useful Improvement in Stovepipe-Dampers, of which the following is a specification.

My invention relates to a stovepip'edam per, and has for its object to provide a simple, inexpensive, and reliabledevice of the kind that is easily mounted in a pipe and that is readily adjusted to desired positions to regulate the draft and secured in suchpositionby means which indicate the degree of opening. I accomplish these objects by constructing a damper as hereinafter described, and illustrated in the drawings, in which Figure 1 is a bottom viewof my invention. mounted in a stovepipe; and Fig. 2 is a longitudinal section of a Stovepipe equipped with my invention,- the section being in a plane of the axis of the pipe.

' In the drawings, 1 represents a Stovepipe, and A a damper, constructed in accordance with my invention, pivotally mounted in the -pipe..

The damper A comprises the semicircular I leaves 2 and 3 of eqiual radius and provided,

respectively, with 1e complementary knuckles 4 andb, which when the leaves are diametrically abutted and extended oppositely in thesame plane extend in axial. alinement diametric of the complete circle formed by the two leaves, the circle having a diameter slightly less than the inner diameter of the Stovepipe i, and a pintle 6, which extends through the knuckles of the leaves and has end portions which extend through suitable orifices in the stovepipe 1 at diametric opposite points, one of which end portions is provided with a fixed head 7 and the other with a head 7, which is detachably threaded thereon. The leaves 2 and 3 thus mount-ed on the pint-ls 6 are each free to rotate thereon independently of the other as the leaves of a hinge.

To the bottom face of the leaf 2 is secured one end portion 8 of an arm-plate 9, which extends by a bend 10 over the knuckle a of the slets 2 and has a 'iree end portion M ore tcm'ling in the same plane ill/l1 the end portion 6%, the end portions 8 and 11 of the arm 59 being in a plane coinciding with the plane of the leaf the end portion 11 being adapted to engage the leaf 3 when the leaf 3 is extended in the same plane as the leaf 2. i The leaf 2 is provided'with a suitable orifice in which issecured by a nut 12 an eye bolt 12, to which is linked one end of a connectin 'rod 13, the opposite end of which is pivota ly connected to an operating-rod 14:, which extends through a suitable orifice in the wall of the stovepipe and through a thimble 15,'sui tably' secured to the wall of the pipe around the orifice, the outer end portion of the rod 14 bein threaded and provided with a suitable knob 16, internally threaded to run thereon, and the inner end with the shoulder 17, form stops for the inward and outward movement of the rod through the thimble. The

thi mble 15 is located in a horizontal plane above the horizontal plane of the pintle-rod 6, and the rod 14 moves in a line that is ,dia-

metric of the Stovepipe and parallel with a which respectively line at right angles to the pintle and diametric of the Stovepipe. The rod 14 is of such.

length between the shoulder 17 and the knob 16 that when the rod 14- is pulled outward until the shoulder 17 is engaged with the pipe 1 the connecting-rod 13 has raised the eaf 2 to a vertical position and when the rod is pushed inward until the knob 16 engages the outer end of the thimhle 15 the leaf 2 is pushed downward through an arc of ninety degrees to a horizontal position.

Intermediate between the shoulder 17 and the knob 16 the rod 14 is provided at intervals of its 11 per circumference with the transverse sha low Ll-shape incuts or notches 18, which incuts are adapted to re ister with an opening in the top ofthe tliimble adapted to receive a ball 20, which is. secured therein by a spring 211. The incuts 18 are formed at such regular intervals oi the rod is as indieats a definite degree of movement of the leaf 2 from a horizontal posit-ion to a vertical, so that may be known when the ball 20 has dropped into any notch to what de use the leaf 2 is opened from the horizonta by the number notches outside the thimble and also the degree of o ening of the leaf 3, since as the leaf 2 is raisec leai 3 will open by grav- ICC ity, as permitted by the arm 9, and as leaf 2 degrees toward a horizontal position. i i hen,

the ball 26 is engaged with a notch 01 the rod opposite pintle-orifices, which is more con-' 14, it frictionally locks the rod against movement inward or outward by the weight of the leavesZ or 3; but a, slight push or ull on the knob 16 is sufficient to raise the bal out of the notch against the pressure of the spring 21.

A damper thus constructed is readily assembled in position in a section of stovepi e by first placing the top side of leaf 3 on t e top side of leaf 2, with the knuckles 5 of leaf 3 alined with the knuckle 4 of the leaf 2, and then inserting the leaves thus conjoined into the pipe and the knuckles with the veniently done than with a solid disk dam er. The knuckles being thus alined with the pintleorifices, the intle -rod is readily inserted, and, the head 7 being run on the threaded end of the pintle-rod, it is firmly secureddiametric of the ipe, with the leaves rotatably mounted t ereon, after which the leaf '3 is turned over into engagement with the arm 9. To mount the adjusting-rod 14 in the thimble, the knob 16 is removed from the end of the rod, and the threaded end is inserted outwardthrough the inner end of the thimble, and the knob being again attached the rod is pulled outward, and the eyebolt 12 is then inserted through the leaf 2 and secured thereto by the nut 12, run in the end of the eyebolt, which completes the attachment of the damper in position for use. I

Preferably the leaves '2 and 3 are provided with a suitable number of draft-orifices 22, which provide the minimum of draft.

I am aware that disk dam ers diametricall mounted on a pintle-rod wbich is journa ed in the pipe and provided with a knob or handle for turning t e damper is in comaccordance with adjustment is made positive,

mon use; but dampers so constructed are more difficult to mount in a pi e, and when mounted soon become loose on t e pintle, and thereafter their 0. .eration becomes uncertain and unreliable; Ey constructing a damper in my invention as shown and described it is readily attached to a pipe, its and :its exact position is indicated.

What I claim to be new'is- The combination with a vertically disposed stove ipe, of a pintle-rod secured diametric of t e pipe, 9., pair of semicircular leaves of equal radii rotatably and independently mounted on the pintle by complementary knuckles formed on the leaves, and alined diametric of the circle of the leaves, an arm secured to one side of one leaf and adapted to engage the corresponding side of the other leaf, when the leaves are extended opposite in a common plane, means connected to one leaf comprising a pivotall -jointed rod extending into the pipe and a a ted to move the leaf u ward and downward t ough an are from a orizontal to a vertical plane and return, the other leaf being oppositely moved through a diametrically opposite are in one direction by gravity, and in the op 0- site direction by the arm, and means to y'1e dingly lock the rod at definite degrees of movement of the leaf through the arc, substantially as set forth.

In witness whereof I have hereunto si ed my name, in the presence of two subscriing witnesses, this 31st day of January, 1906.

- ANNA SCHVVOLL.

In presence of- GEORGE RGREENHALGH, CHAS. A. BooKE. 

